#include "log.h"
#include "util.h"
+#include "strv.h"
#include "macro.h"
#include "mkdir.h"
#include "special.h"
#include "conf-parser.h"
#include "copy.h"
#include "stacktrace.h"
+#include "path-util.h"
+#include "compress.h"
#ifdef HAVE_ACL
-#include <sys/acl.h>
-#include "acl-util.h"
+# include <sys/acl.h>
+# include "acl-util.h"
+#endif
+
+#ifdef HAVE_XZ
+# include <lzma.h>
+#else
+# define LZMA_PRESET_DEFAULT 0
#endif
/* The maximum size up to which we process coredumps */
assert_cc(JOURNAL_SIZE_MAX <= ENTRY_SIZE_MAX);
enum {
- ARG_PID = 1,
- ARG_UID,
- ARG_GID,
- ARG_SIGNAL,
- ARG_TIMESTAMP,
- ARG_COMM,
- _ARG_MAX
+ INFO_PID,
+ INFO_UID,
+ INFO_GID,
+ INFO_SIGNAL,
+ INFO_TIMESTAMP,
+ INFO_COMM,
+ INFO_EXE,
+ _INFO_LEN
};
typedef enum CoredumpStorage {
_COREDUMP_STORAGE_INVALID = -1
} CoredumpStorage;
-static CoredumpStorage arg_storage = COREDUMP_STORAGE_EXTERNAL;
-static off_t arg_process_size_max = PROCESS_SIZE_MAX;
-static off_t arg_external_size_max = EXTERNAL_SIZE_MAX;
-static size_t arg_journal_size_max = JOURNAL_SIZE_MAX;
-
static const char* const coredump_storage_table[_COREDUMP_STORAGE_MAX] = {
[COREDUMP_STORAGE_NONE] = "none",
[COREDUMP_STORAGE_EXTERNAL] = "external",
};
DEFINE_PRIVATE_STRING_TABLE_LOOKUP(coredump_storage, CoredumpStorage);
-static DEFINE_CONFIG_PARSE_ENUM(config_parse_coredump_storage, coredump_storage, CoredumpStorage, "Failed to parse storage setting");
+static DEFINE_CONFIG_PARSE_ENUM(config_parse_coredump_storage, coredump_storage,
+ CoredumpStorage,
+ "Failed to parse storage setting");
+
+typedef enum CoredumpCompression {
+ COREDUMP_COMPRESSION_NONE,
+ COREDUMP_COMPRESSION_XZ,
+ _COREDUMP_COMPRESSION_MAX,
+ _COREDUMP_COMPRESSION_INVALID = -1
+} CoredumpCompression;
+
+static const char* const coredump_compression_table[_COREDUMP_COMPRESSION_MAX] = {
+ [COREDUMP_COMPRESSION_NONE] = "none",
+ [COREDUMP_COMPRESSION_XZ] = "xz",
+};
+
+DEFINE_PRIVATE_STRING_TABLE_LOOKUP(coredump_compression, CoredumpCompression);
+static DEFINE_CONFIG_PARSE_ENUM(config_parse_coredump_compression, coredump_compression,
+ CoredumpCompression,
+ "Failed to parse compression setting");
+
+static CoredumpStorage arg_storage = COREDUMP_STORAGE_EXTERNAL;
+static CoredumpCompression arg_compression = COREDUMP_COMPRESSION_XZ;
+static unsigned arg_compression_level = LZMA_PRESET_DEFAULT;
+
+static off_t arg_process_size_max = PROCESS_SIZE_MAX;
+static off_t arg_external_size_max = EXTERNAL_SIZE_MAX;
+static size_t arg_journal_size_max = JOURNAL_SIZE_MAX;
static int parse_config(void) {
static const ConfigTableItem items[] = {
- { "Coredump", "ProcessSizeMax", config_parse_iec_off, 0, &arg_process_size_max },
- { "Coredump", "ExternalSizeMax", config_parse_iec_off, 0, &arg_external_size_max },
- { "Coredump", "JournalSizeMax", config_parse_iec_size, 0, &arg_journal_size_max },
- { "Coredump", "Storage", config_parse_coredump_storage, 0, &arg_storage },
+ { "Coredump", "Storage", config_parse_coredump_storage, 0, &arg_storage },
+ { "Coredump", "Compression", config_parse_coredump_compression, 0, &arg_compression },
+ { "Coredump", "CompressionLevel", config_parse_unsigned, 0, &arg_compression_level },
+
+ { "Coredump", "ProcessSizeMax", config_parse_iec_off, 0, &arg_process_size_max },
+ { "Coredump", "ExternalSizeMax", config_parse_iec_off, 0, &arg_external_size_max },
+ { "Coredump", "JournalSizeMax", config_parse_iec_size, 0, &arg_journal_size_max },
{}
};
false,
false,
NULL);
+
+#ifdef HAVE_XZ
+ if (arg_compression_level > 9) {
+ log_warning("Invalid CompressionLevel %u, ignoring.", arg_compression_level);
+ arg_compression_level = LZMA_PRESET_DEFAULT;
+ }
+#endif
}
static int fix_acl(int fd, uid_t uid) {
return 0;
}
-static int fix_xattr(int fd, char *argv[]) {
+static int fix_xattr(int fd, const char *info[_INFO_LEN]) {
- static const char * const xattrs[_ARG_MAX] = {
- [ARG_PID] = "user.coredump.pid",
- [ARG_UID] = "user.coredump.uid",
- [ARG_GID] = "user.coredump.gid",
- [ARG_SIGNAL] = "user.coredump.signal",
- [ARG_TIMESTAMP] = "user.coredump.timestamp",
- [ARG_COMM] = "user.coredump.comm",
+ static const char * const xattrs[_INFO_LEN] = {
+ [INFO_PID] = "user.coredump.pid",
+ [INFO_UID] = "user.coredump.uid",
+ [INFO_GID] = "user.coredump.gid",
+ [INFO_SIGNAL] = "user.coredump.signal",
+ [INFO_TIMESTAMP] = "user.coredump.timestamp",
+ [INFO_COMM] = "user.coredump.comm",
+ [INFO_EXE] = "user.coredump.exe",
};
int r = 0;
unsigned i;
- /* Attach some metadate to coredumps via extended
+ /* Attach some metadata to coredumps via extended
* attributes. Just because we can. */
- for (i = 0; i < _ARG_MAX; i++) {
- if (isempty(argv[i]))
+ for (i = 0; i < _INFO_LEN; i++) {
+ int k;
+
+ if (isempty(info[i]) || !xattrs[i])
continue;
- if (fsetxattr(fd, xattrs[i], argv[i], strlen(argv[i]), XATTR_CREATE) < 0)
+ k = fsetxattr(fd, xattrs[i], info[i], strlen(info[i]), XATTR_CREATE);
+ if (k < 0 && r == 0)
r = -errno;
}
return r;
}
-#define filename_escape(s) xescape((s), "./")
+#define filename_escape(s) xescape((s), "./ ")
+
+static int fix_permissions(int fd, const char *filename, const char *target,
+ const char *info[_INFO_LEN], uid_t uid) {
+
+ /* Ignore errors on these */
+ fchmod(fd, 0640);
+ fix_acl(fd, uid);
+ fix_xattr(fd, info);
+
+ if (fsync(fd) < 0) {
+ log_error("Failed to sync coredump %s: %m", filename);
+ return -errno;
+ }
+
+ if (rename(filename, target) < 0) {
+ log_error("Failed to rename coredump %s -> %s: %m", filename, target);
+ return -errno;
+ }
+
+ return 0;
+}
+
+static int maybe_remove_external_coredump(const char *filename, off_t size) {
+
+ /* Returns 1 if might remove, 0 if will not remove, <0 on error. */
+
+ if (IN_SET(arg_storage, COREDUMP_STORAGE_EXTERNAL, COREDUMP_STORAGE_BOTH) &&
+ size <= arg_external_size_max)
+ return 0;
+
+ if (!filename)
+ return 1;
+
+ if (unlink(filename) < 0) {
+ log_error("Failed to unlink %s: %m", filename);
+ return -errno;
+ }
+
+ return 1;
+}
+
+
+static int save_external_coredump(const char *info[_INFO_LEN],
+ uid_t uid,
+ char **ret_filename,
+ int *ret_fd,
+ off_t *ret_size) {
-static int save_external_coredump(char **argv, uid_t uid, char **ret_filename, int *ret_fd, off_t *ret_size) {
_cleanup_free_ char *p = NULL, *t = NULL, *c = NULL, *fn = NULL, *tmp = NULL;
_cleanup_close_ int fd = -1;
sd_id128_t boot;
struct stat st;
int r;
- assert(argv);
+ assert(info);
assert(ret_filename);
assert(ret_fd);
assert(ret_size);
- c = filename_escape(argv[ARG_COMM]);
+ c = filename_escape(info[INFO_COMM]);
if (!c)
return log_oom();
- p = filename_escape(argv[ARG_PID]);
+ p = filename_escape(info[INFO_PID]);
if (!p)
return log_oom();
- t = filename_escape(argv[ARG_TIMESTAMP]);
+ t = filename_escape(info[INFO_TIMESTAMP]);
if (!t)
return log_oom();
fd = open(tmp, O_CREAT|O_EXCL|O_RDWR|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0640);
if (fd < 0) {
- log_error("Failed to create coredump file: %m");
+ log_error("Failed to create coredump file %s: %m", tmp);
return -errno;
}
- r = copy_bytes(STDIN_FILENO, fd);
- if (r < 0) {
+ r = copy_bytes(STDIN_FILENO, fd, arg_process_size_max);
+ if (r == -E2BIG) {
+ log_error("Coredump of %s (%s) is larger than configured processing limit, refusing.",
+ info[INFO_PID], info[INFO_COMM]);
+ goto fail;
+ } else if (IN_SET(r, -EDQUOT, -ENOSPC)) {
+ log_error("Not enough disk space for coredump of %s (%s), refusing.",
+ info[INFO_PID], info[INFO_COMM]);
+ goto fail;
+ } else if (r < 0) {
log_error("Failed to dump coredump to file: %s", strerror(-r));
goto fail;
}
- /* Ignore errors on these */
- fchmod(fd, 0640);
- fix_acl(fd, uid);
- fix_xattr(fd, argv);
-
- if (fsync(fd) < 0) {
- log_error("Failed to sync coredump: %m");
- r = -errno;
- goto fail;
+ if (lseek(fd, 0, SEEK_SET) == (off_t) -1) {
+ log_error("Failed to seek on %s: %m", tmp);
+ goto uncompressed;
}
if (fstat(fd, &st) < 0) {
- log_error("Failed to fstat coredump: %m");
- r = -errno;
+ log_error("Failed to fstat coredump %s: %m", tmp);
goto fail;
}
- if (rename(tmp, fn) < 0) {
- log_error("Failed to rename coredump: %m");
- r = -errno;
- goto fail;
+#ifdef HAVE_XZ
+ /* If we will remove the coredump anyway, do not compress. */
+ if (maybe_remove_external_coredump(NULL, st.st_size) == 0
+ && arg_compression == COREDUMP_COMPRESSION_XZ) {
+
+ _cleanup_free_ char *fn2 = NULL;
+ char *tmp2;
+ _cleanup_close_ int fd2 = -1;
+
+ tmp2 = strappenda(tmp, ".xz");
+ fd2 = open(tmp2, O_CREAT|O_EXCL|O_RDWR|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0640);
+ if (fd2 < 0) {
+ log_error("Failed to create file %s: %m", tmp2);
+ goto uncompressed;
+ }
+
+ r = compress_stream(fd, fd2, arg_compression_level, -1);
+ if (r < 0) {
+ log_error("Failed to compress %s: %s", tmp2, strerror(-r));
+ unlink_noerrno(tmp2);
+ goto fail2;
+ }
+
+ fn2 = strappend(fn, ".xz");
+ if (!fn2) {
+ log_oom();
+ goto fail2;
+ }
+
+ r = fix_permissions(fd2, tmp2, fn2, info, uid);
+ if (r < 0)
+ goto fail2;
+
+ *ret_filename = fn2; /* compressed */
+ *ret_fd = fd; /* uncompressed */
+ *ret_size = st.st_size; /* uncompressed */
+
+ fn2 = NULL;
+ fd = -1;
+
+ return 0;
+
+ fail2:
+ unlink_noerrno(tmp2);
}
+#endif
+
+uncompressed:
+ r = fix_permissions(fd, tmp, fn, info, uid);
+ if (r < 0)
+ goto fail;
*ret_filename = fn;
*ret_fd = fd;
field = malloc(9 + size);
if (!field) {
- log_warning("Failed to allocate memory fore coredump, coredump will not be stored.");
+ log_warning("Failed to allocate memory for coredump, coredump will not be stored.");
return -ENOMEM;
}
return 0;
}
-static int maybe_remove_external_coredump(const char *filename, off_t size) {
-
- if (!filename)
- return 0;
-
- if (IN_SET(arg_storage, COREDUMP_STORAGE_EXTERNAL, COREDUMP_STORAGE_BOTH) &&
- size <= arg_external_size_max)
- return 0;
-
- if (unlink(filename) < 0) {
- log_error("Failed to unlink %s: %m", filename);
- return -errno;
- }
-
- return 0;
-}
-
int main(int argc, char* argv[]) {
_cleanup_free_ char *core_pid = NULL, *core_uid = NULL, *core_gid = NULL, *core_signal = NULL,
*core_timestamp = NULL, *core_comm = NULL, *core_exe = NULL, *core_unit = NULL,
*core_session = NULL, *core_message = NULL, *core_cmdline = NULL, *coredump_data = NULL,
- *coredump_filename = NULL, *core_slice = NULL, *core_cgroup = NULL, *core_owner_uid = NULL,
- *exe = NULL;
+ *core_slice = NULL, *core_cgroup = NULL, *core_owner_uid = NULL,
+ *exe = NULL, *comm = NULL, *filename = NULL;
+ const char *info[_INFO_LEN];
_cleanup_close_ int coredump_fd = -1;
- struct iovec iovec[17];
+ struct iovec iovec[18];
off_t coredump_size;
int r, j = 0;
uid_t uid, owner_uid;
log_set_target(LOG_TARGET_KMSG);
log_open();
- if (argc != _ARG_MAX) {
- log_error("Invalid number of arguments passed from kernel.");
+ if (argc < INFO_COMM + 1) {
+ log_error("Not enough arguments passed from kernel (%d, expected %d).",
+ argc - 1, INFO_COMM + 1 - 1);
r = -EINVAL;
goto finish;
}
/* Ignore all parse errors */
parse_config();
- log_debug("Selected storage '%s'.", coredump_storage_to_string(arg_storage));
+ log_debug("Selected storage '%s'.",
+ coredump_storage_to_string(arg_storage));
+ log_debug("Selected compression %s:%u.",
+ coredump_compression_to_string(arg_compression),
+ arg_compression_level);
- r = parse_uid(argv[ARG_UID], &uid);
+ r = parse_uid(argv[INFO_UID + 1], &uid);
if (r < 0) {
log_error("Failed to parse UID.");
goto finish;
}
- r = parse_pid(argv[ARG_PID], &pid);
+ r = parse_pid(argv[INFO_PID + 1], &pid);
if (r < 0) {
log_error("Failed to parse PID.");
goto finish;
}
- r = parse_gid(argv[ARG_GID], &gid);
+ r = parse_gid(argv[INFO_GID + 1], &gid);
if (r < 0) {
log_error("Failed to parse GID.");
goto finish;
}
+ if (get_process_comm(pid, &comm) < 0) {
+ log_warning("Failed to get COMM, falling back to the commandline.");
+ comm = strv_join(argv + INFO_COMM + 1, " ");
+ }
+
+ if (get_process_exe(pid, &exe) < 0)
+ log_warning("Failed to get EXE.");
+
+ info[INFO_PID] = argv[INFO_PID + 1];
+ info[INFO_UID] = argv[INFO_UID + 1];
+ info[INFO_GID] = argv[INFO_GID + 1];
+ info[INFO_SIGNAL] = argv[INFO_SIGNAL + 1];
+ info[INFO_TIMESTAMP] = argv[INFO_TIMESTAMP + 1];
+ info[INFO_COMM] = comm;
+ info[INFO_EXE] = exe;
+
if (cg_pid_get_unit(pid, &t) >= 0) {
if (streq(t, SPECIAL_JOURNALD_SERVICE)) {
if (arg_storage != COREDUMP_STORAGE_NONE)
arg_storage = COREDUMP_STORAGE_EXTERNAL;
- r = save_external_coredump(argv, uid, &coredump_filename, &coredump_fd, &coredump_size);
+ r = save_external_coredump(info, uid, &filename, &coredump_fd, &coredump_size);
if (r < 0)
goto finish;
- r = maybe_remove_external_coredump(coredump_filename, coredump_size);
+ r = maybe_remove_external_coredump(filename, coredump_size);
if (r < 0)
goto finish;
- log_info("Detected coredump of the journal daemon itself, diverted to %s.", coredump_filename);
+ log_info("Detected coredump of the journal daemon itself, diverted to %s.", filename);
goto finish;
}
log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
log_open();
- core_pid = strappend("COREDUMP_PID=", argv[ARG_PID]);
+ core_pid = strappend("COREDUMP_PID=", info[INFO_PID]);
if (core_pid)
IOVEC_SET_STRING(iovec[j++], core_pid);
- core_uid = strappend("COREDUMP_UID=", argv[ARG_UID]);
+ core_uid = strappend("COREDUMP_UID=", info[INFO_UID]);
if (core_uid)
IOVEC_SET_STRING(iovec[j++], core_uid);
- core_gid = strappend("COREDUMP_GID=", argv[ARG_GID]);
+ core_gid = strappend("COREDUMP_GID=", info[INFO_GID]);
if (core_gid)
IOVEC_SET_STRING(iovec[j++], core_gid);
- core_signal = strappend("COREDUMP_SIGNAL=", argv[ARG_SIGNAL]);
+ core_signal = strappend("COREDUMP_SIGNAL=", info[INFO_SIGNAL]);
if (core_signal)
IOVEC_SET_STRING(iovec[j++], core_signal);
- core_comm = strappend("COREDUMP_COMM=", argv[ARG_COMM]);
- if (core_comm)
- IOVEC_SET_STRING(iovec[j++], core_comm);
-
if (sd_pid_get_session(pid, &t) >= 0) {
core_session = strappend("COREDUMP_SESSION=", t);
free(t);
IOVEC_SET_STRING(iovec[j++], core_slice);
}
- if (get_process_exe(pid, &exe) >= 0) {
+ if (comm) {
+ core_comm = strappend("COREDUMP_COMM=", comm);
+ if (core_comm)
+ IOVEC_SET_STRING(iovec[j++], core_comm);
+ }
+
+ if (exe) {
core_exe = strappend("COREDUMP_EXE=", exe);
if (core_exe)
IOVEC_SET_STRING(iovec[j++], core_exe);
IOVEC_SET_STRING(iovec[j++], core_cgroup);
}
- core_timestamp = strjoin("COREDUMP_TIMESTAMP=", argv[ARG_TIMESTAMP], "000000", NULL);
+ core_timestamp = strjoin("COREDUMP_TIMESTAMP=", info[INFO_TIMESTAMP], "000000", NULL);
if (core_timestamp)
IOVEC_SET_STRING(iovec[j++], core_timestamp);
IOVEC_SET_STRING(iovec[j++], "PRIORITY=2");
/* Always stream the coredump to disk, if that's possible */
- r = save_external_coredump(argv, uid, &coredump_filename, &coredump_fd, &coredump_size);
+ r = save_external_coredump(info, uid, &filename, &coredump_fd, &coredump_size);
if (r < 0)
- goto finish;
+ /* skip whole core dumping part */
+ goto log;
/* If we don't want to keep the coredump on disk, remove it
* now, as later on we will lack the privileges for
* it. However, we keep the fd to it, so that we can still
* process it and log it. */
- r = maybe_remove_external_coredump(coredump_filename, coredump_size);
+ r = maybe_remove_external_coredump(filename, coredump_size);
if (r < 0)
goto finish;
+ if (r == 0) {
+ const char *coredump_filename;
+
+ coredump_filename = strappenda("COREDUMP_FILENAME=", filename);
+ IOVEC_SET_STRING(iovec[j++], coredump_filename);
+ }
/* Now, let's drop privileges to become the user who owns the
* segfaulted process and allocate the coredump memory under
r = coredump_make_stack_trace(coredump_fd, exe, &stacktrace);
if (r >= 0)
- core_message = strjoin("MESSAGE=Process ", argv[ARG_PID], " (", argv[ARG_COMM], ") of user ", argv[ARG_UID], " dumped core.\n\n", stacktrace, NULL);
+ core_message = strjoin("MESSAGE=Process ", info[INFO_PID], " (", comm, ") of user ", info[INFO_UID], " dumped core.\n\n", stacktrace, NULL);
else
log_warning("Failed to generate stack trace: %s", strerror(-r));
}
if (!core_message)
#endif
- core_message = strjoin("MESSAGE=Process ", argv[ARG_PID], " (", argv[ARG_COMM], ") of user ", argv[ARG_UID], " dumped core.", NULL);
+log:
+ core_message = strjoin("MESSAGE=Process ", info[INFO_PID], " (", comm, ") of user ", info[INFO_UID], " dumped core.", NULL);
if (core_message)
IOVEC_SET_STRING(iovec[j++], core_message);
~ianmdlvl / elogind.git / blobdiff